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covered with a surface patch. The remediation equipment was delivered to ASE August 5, 2002. The remediation equipment was placed at the site, wired and connected to the underground tubing by August 8, 2002. A detailed drawing of the manifold to sparge well connection is included as Figure 6. 5 "3 Ozone Generator All of the underground tubing was bundled together and located just beneath the C-Sparger System manufactured by KVA Associates. The C- Sparger System is a compact unit that generates an air/ozone mixture on- site; ozone is generated at a rate of 2 grams per hour. The unit then pumps the air/ozone mixture through ten ports one port at a time on a cycle set by a timer. The air/ozone flow is approximately 3 to S cubic feet per minute (cfm) at a pressure of up to 20-30 psi. Initially, each sparge point has been programmed to receive the air/ozone mixture for 7 minutes, 18 times per day. The cycle timing has been programmed; however, cycle duration can be adjusted as needed. The entire unit operates on 110-volt power. A diagram of the C-Sparer unit is included as Figure 7. 6 . 0 SYSTEM OPERATION On August 12, 2002, the C-Sparger was programmed and tested by ASE and McCulloch Environmental personnel. McCulloch is the local distributor and service group for the remediation equipment. On August 13, 2002, the system was officially turned on. Just prior to system start- up, ASE measured the dissolved oxygen (DO) content in the six on-site groundwater monitoring wells, see Table One. The system has been designed to operate continuously 24-hours a day, 7 days a week. The system operated flawlessly during the first week of operation, when it was being checked daily by ASEpersonnel. During the second week of operation, the system went down due to a malfunctioned power switch. The system had been off for several days prior to ASE's discovery of the failed switch. The wiring problem was repaired by ASE personnel, and the system was turned on again. During the second week of September, ASE personnel noted that the air pressures began fluctuating, especially when tapping on the individual solenoids for each well. What this indicated was that the electronic valves (solenoids) that were programmed to open and close at specified times, ' were likely not closing completely. This would mean that the ozone/air Singh's Unocal System Installation and Operation Report — October 2002 -3-